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-% TITLE PAGE
-\pagestyle{empty}
-\begin{center}
-\vspace*{\fill}
-\includegraphics{figs/xenlogo.eps}
-\vfill
-\vfill
-\vfill
-\begin{tabular}{l}
-{\Huge \bf Xend} \\[4mm]
-{\huge Xen v2.0 for x86} \\[80mm]
-
-{\Large Xen is Copyright (c) 2004, The Xen Team} \\[3mm]
-{\Large University of Cambridge, UK} \\[20mm]
-{\large Last updated 30 August 2004}
-\end{tabular}
-\vfill
-\end{center}
-\cleardoublepage
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-\seca{Introduction}
-Xend is the control daemon used to manage a machine running the Xen hypervisor.
-Xend is responsible for creating and destroying domains and managing their
-resources, such as virtual block devices and virtual network interfaces.
-
-Xend exists because the Xen hypervisor itself only manages the memory image
-of a domain and its scheduling. Xen provides the event channels that connect
-a domain to its devices, but is intentionally not involved in setting them up.
-
-Xend runs as a daemon in the privileged domain 0 and uses a low-level api
-to communicate with Xen via the domain 0 kernel. Xend exports its control
-interface to its clients using HTTP. Most programming languages have
-HTTP client libraries, so this interface can be used from most popular 
-languages, for example Python, Perl, C, Java.
-Xend itself is written in Python, as are most of the Xen tools.
-
-The xend interface is intended to be a complete interface for the creation
-and management of domains. It supports domain creation, shutdown, reboot,
-destruction, save, restore and migration.
-
-When xend creates a domain it creates the domain memory image and communicates
-with the device driver domain(s) to configure the devices for the domain.
-This sets up connections between the domain and backend device controllers
-in the driver domain. When a domain shuts down its memory image cannot be fully released
-unless its backend devices are released and disconnected. This is done by xend.
-In order to protect against loss of this information when xend is restarted,
-xend maintains a persistent database of domain configurations. This allows
-xend to be stopped and restarted without loss of configuration information.
-For example, in order to upgrade the xend software.
-
-\seca{Domain lifecycle}
-\secb{Domain creation}
-Xend is instructed to create a domain by posting a domain\_create message to it,
-containing the domain configuration to be instantiated. The domain configuration
-is in sxp format and is as far as possible {\em fully-bound}, that is, all
-parameters are fully-specified. The domain configuration is saved in the filesystem
-so that it can be reused later if necessary.
-
-The domain configuration specifies the domain name, memory size, kernel image
-and parameters, and all the domain devices. Xend uses the Xen api to create
-the domain memory image, and then {\em builds} the memory image for the domain
-using the kernel image. At this point the domain exists, but it cannot be run because
-it has no devices. Xend then communicates with the device driver domain to create
-the configured devices. Once the devices are created it sets up event channels
-for them between the driver domain and the new domain, and notifies the new domain
-that its devices are connected. At this point the domain can be started.
-
-Xend is also responsible for managing domain consoles. When a domain is created,
-xend sets up a console event channel to the domain, and creates a TCP listening port
-for the domain console. When a connection is accepted to the port, xend
-connects input and output for the port to the domain console channel.
-
-\secb{Domain destruction}
-When a domain terminates, because it has been shutdown or it has crashed, the
-domain resources must be released so that the domain memory image can be
-finally removed from xen. Xend monitors the domains, and is also signaled by
-xen (using a VIRQ) when a domain exits. Xend examines the domain states and
-determines which domains have exited. It then communicates with the driver domain
-to release the devices for exited domains. Xend also closes any open console
-connections and removes the TCP listeners for exited domains.
-Once all devices have been released it instructs xen to destroy the memory image.
-
-\secb{Domain restart}
-Domain restart is the xen equivalent of a machine reboot. When a domain
-exits because it has been shutdown in reboot mode, its exit code is reboot.
-When examining domains to find those that have exited and destroy them,
-xend detects those that have exited for reboot and does not completely destroy
-them. It disconnects all their devices, and detaches the console listener
-from its channel to the domain, but does not close it. Instead it schedules
-a call to rebuild the domain from its configuration. This proceeds almost
-identically to creating the domain, except that the console listener is
-reused and connected to the new domain. This allows existing console
-connections to remain connected across a domain restart. The restarted
-domain keeps the same name and domain id.
-
-The determination of when to restart a domain is in fact slightly more
-complex than described above. A domain is configured with a 
-{\em restart mode}. If the restart mode is {\em onreboot}, the default,
-restart happens when the domain is shutdown normally and
-exits with code reboot. If the restart mode is {\em never} the domain is
-not restarted. If the restart mode is {\em always} the domain is always
-restarted, regardless of how it exited.
-
-In order to prevent continual domain crash causing restart loops, xend
-has a {\em minimum restart time}. Xend remembers when a domain was last
-restarted and will fail a restart that happens inside the minimum
-restart time.
-
-\seca{Devices}
-\secb{Virtual network interfaces}
-Each virtual network interface (vif) has 2 parts: the font-end device in its domain,
-and the back-end device in the driver domain. Usually the driver domain is domain 0,
-and there is a linux network device corresponding to the vif. The linux device for
-interface N on domain D is called vifD.N. When a packet is sent on the vif in the 
-domain the packet is received from the linux device. The linux devices are connected
-to network interfaces using ethernet bridging.
-
-The default setup is a bridge xen-br0, with eth0 connected to it, and the routes
-for eth0 directed at xen-br0. This is controlled by the xend network setup script,
-default {\tt /etc/xen/network}, which is run when xend starts.
-
-When the vifs for a domain are created, a vif control script, default {\tt /etc/xen/vif-bridge},
-is run to connect the vif to its bridge. The default script connects the vif
-to xen-br0 and optionally sets up iptables rules to prevent IP address spoofing.
-The bridge a vif is connected to can be defined in its configuration, and this is useful
-for setting up virtual networks using several bridges.
-
-\secb{Virtual block devices}
-Virtual block devices in a domain are interfaces onto back-end device drivers
-that export physical devices to domains. In the default configuration the back-end
-driver is in domain 0 and can export any linux block device to a domain. This includes
-physical disk partitions, LVM volumes and loopback mounts of files. In fact anything
-that linux can represent as a block device can be exported to a domain as virtual
-block device.
-
-\seca{Xend invocation}
-Xend is started (by root) using the command
-\begin{verbatim}
-xend start
-\end{verbatim}
-Xend can be stopped using
-\begin{verbatim}
-xend stop
-\end{verbatim}
-Xend must be started before any domains (apart from domain 0) can be created.
-If you try to use the {\tt xm} tool when xend is not running you will get a
-'connection refused' message.
-
-\secb{Xend configuration}
-Xend reads its own configuration from {\tt /etc/xen/xend-config.sxp}, which is
-a sequence of s-expressions. The configuration parameters are:
-\begin{itemize}
-
-\item xend-port: Port xend should use for the HTTP interface (default 8000).
-
-\item xend-address: Address xend should listen on.
-  Specifying 'localhost' prevents remote connections.
-  Specifying the empty string '' allows all connections, and is the default.
-
-\item network-script: The script used to start/stop networking for xend (default network).
-
-\item vif-bridge: The default bridge that virtual interfaces should be connected to
-  (default xen-br0).
-
-\item vif-script: The default script used to control virtual interfaces
-  (default vif-bridge).
-
-\item vif-antispoof: Whether iptables should be set up to prevent IP spoofing for
-  virtual interfaces (default yes).
-\end{itemize}
-
-Configuration scripts ({\it e.g.} for network-script) are looked for in {\tt /etc/xen}
-unless their name begins with '/'.
-
-Xend sends its log output to {\tt /var/log/xen/xend.log}. This is a rotating logfile,
-and logs are moved onto {\tt xend.log.1} {\it etc.} as they get large. Old logs may
-be deleted.
-
-\secb{Xend database}
-Xend needs to make some data persistent, and it uses files under {\tt /var/xen/xend-db}
-for this. The persistent data is stored in files in SXP format. Domain information
-is saved when domains are created. When xend starts it reads the file {\tt /var/xen/lastboot}
-(if it exists) to determine the last time the system was rebooted. It compares this time
-with the last reboot time in {\tt wtmp} to determine if the system has been rebooted
-since xend last ran. If the system has been rebooted xend removes all its saved data
-that is not persistent across reboots (for example domain data).
-
-\seca{Xend HTTP Interface}
- The xend interface uses HTTP 1.1 \cite{http} as its transport.
-Simple PUT and GET calls can encode parameters using the standard url-encoding 
-for parameters: MIME type {\tt application/x-www-form-urlencoded}.
-When file upload is required, the {\tt multipart/form-data} encoding is used.
-See the HTML 4.1 specification for details \cite{html}.
-
-Xend functions as a webserver and supports two interfaces: one
-for web-browsers and one for programs.
-The web-browser interface returns replies in HTML and includes forms
-for interactive operations such as stopping domains and creating domains
-from an uploaded configuration. The programmatic interface usually returns replies
-in s-expression format. Both interfaces are accessed
-in exactly the same way over HTTP - the only difference is the data returned.
-
-The webserver distinguishes browsers from programs using the {\tt User-Agent}
-and {\tt Accept} headers in the HTTP request. If there is no {\tt User-Agent} or no
-{\tt Acccept} header, or {\tt Accept} includes the type {\tt application/sxp}, the
-webserver assumes the client is a program and returns SXP. Otherwise
-it assumes the client is a webserver and returns HTML.
-In some cases the return value is essentially a string, so {\tt Content-Type}
-{\tt text/plain} is returned.
-
-The HTTP api supported is listed below. All paths in it are relative to the
-server root, for example {\tt http://localhost:8000/xend}.
-As defined in the HTTP specification, we use GET for side-effect free
-operations that may safely be repeated, and POST for operations with
-side-effects. For each request we list the HTTP method (GET or POST),
-the url relative to the server root, the operation name and arguments (if any).
-The operation name is passed as request parameter 'op', and the arguments
-are passed by name. Operation name and parameters can be encoded using either
-encoding described above. We also list the corresponding api function from the
-Python client interface in {\tt xen.xend.XendClient}.
-
-\begin{itemize}
-\item {\tt GET /},\\
-  {\tt xend()}:\\
-  Get list of urls under xend root.
-
-\item {\tt GET /node},\\
-  {\tt xend\_node()}:\\
-  Get node information.
-
-\item {\tt POST /node shutdown()},\\
-  {\tt xend\_node\_shutdown()}:\\
-  Shutdown the node
-
-\item {\tt POST /node reboot()},\\
-  {\tt xend\_node\_reboot()}:\\
-  Reboot the node
-
-\item {\tt POST /node notify()}:\\
-  Set node notification url
-  
-\item {\tt GET /node/dmesg},\\
-  {\tt xend\_node\_dmesg()}:\\
-  Get xen boot message.
-
-\item {\tt GET /node/log},\\
-  {\tt xend\_node\_log()}:\\
-  Get xend log.
-
-\item {\tt GET /domain}\\
-  {\tt xend\_domains()}:\\
-  Get list of domains.
-
-\item {\tt POST /domain create(config)},\\
-  {\tt xend\_domain\_create(config)}:\\
-  Create a domain.
-
-\item {\tt POST /domain restore(file)},\\
-  {\tt xend\_domain\_restore(filename)}:\\
-  Restore a saved domain.
-
-\item {\tt GET /domain/<dom>},\\
-  {\tt xend\_domain(dom)}:\\
-  Get domain information.
-
-\item {\tt POST /domain/[dom] configure(config)},\\
-  {\tt xend\_domain\_configure(dom, conf)}:\\
-  Configure an existing domain (for internal use by restore and migrate).
-
-\item {\tt POST /domain/[dom] unpause()},\\
-  {\tt xend\_domain\_unpause(dom)}:\\
-  Start domain running
-
-\item {\tt POST /domain/[dom] pause()},\\
-  {\tt xend\_domain\_pause(dom)}:\\
-  Stop domain running.
-
-\item {\tt POST /domain/[dom] shutdown(reason)},\\
-  {\tt xend\_domain\_shutdown(dom, reason)}:\\
-  Shutdown domain, reason can be reboot, poweroff, halt.
-
-\item {\tt POST /domain/[dom] destroy(reason)},\\
-  {\tt xend\_domain\_destroy(dom, reason)}:\\
-  Destroy domain, reason can be reboot, halt.
-
-\item {\tt POST /domain/[dom] save(file)},\\
-  {\tt xend\_domain\_save(dom, filename)}:\\
-  Save a domain to a file.
-
-\item {\tt POST /domain/[dom] migrate(dst)},\\
-  {\tt xend\_domain\_migrate(dom, dst)}:\\
-  Migrate a domain.
-
-\item {\tt POST /domain/[dom] pincpu(cpu)},\\
-  {\tt xend\_domain\_pincpu(self, id, cpu)}\\:
-  Pin a domain to a cpu.
-
-\item {\tt POST /domain/[dom] maxmem\_set(memory)},\\
-  {\tt xend\_domain\_maxmem\_set(dom, memory)}:\\
-  Set domain maximum memory limit.
-
-\item {\tt POST /domain/[dom] device\_create(config)}\\
-  {\tt xend\_domain\_device\_create(dom, config)}:\\
-  Add a device to a domain.
-
-\item {\tt POST /domain/[dom] device\_destroy(type, index)},\\
-  {\tt xend\_domain\_device\_destroy(dom, type, index)}:\\
-  Delete a device from a domain
-
-\item {\tt GET /domain/[dom] vifs()},\\
-  {\tt xend\_domain\_vifs(dom)}:\\
-  Get virtual network interfaces.
-
-\item {\tt GET /domain/[dom] vif(vif)},\\
-  {\tt xend\_domain\_vif(dom, vif)}:\\
-  Get virtual network interface.
-
-\item {\tt GET /domain/[dom] vbds()},\\
-  {\tt xend\_domain\_vbds(dom)}:\\
-  Get virtual block devices.
-
-\item {\tt GET /domain/[dom] vbd(vbd)},\\
-  {\tt xend\_domain\_vbd(dom, vbd)}:\\
-  Get virtual block device.
-
-\item {\tt GET /console},\\
-  {\tt xend\_consoles()}:\\
-  Get list of consoles.
-
-\item {\tt GET /console/[id]}\\
-  {\tt xend\_console(id)}:\\
-  Get information about a console.
-
-\item {\tt GET /console/[id] disconnect()}\\
-  {\tt xend\_console\_disconnect(self, id)}:\\
-  Disconnect any console TCP connection.
-
-\item {\tt POST /event inject(event)}\\
-  {\tt xend\_event\_inject(sxpr)}:\\
-  Inject an event.
-
-\end{itemize}
-
-\secb{Xend debugging interface}
-Xend also listens on port 8001. Connecting to this port (for example via telnet)
-allows access to some debugging functions:
-\begin{itemize}
-\item help: list functions
-\item traceon: turn xend tracing on
-\item traceoff: turn xend tracing off
-\item quit: disconnect.
-\item info: list console listeners, block and network device controllers.
-\end{itemize}
-
-When tracing is on xend logs all functions calls and exceptions to
-{\tt /var/log/xen/xend.trace}.
-
-\begin{thebibliography}{99}
-
-\bibitem{html}
-HTML 4.01 Specification,\\
-http://www.w3.org/TR/html4/,\\
-W3C Recommendation, 24 December 1999.
-
-\bibitem{http}
-Hypertext Transfer Protocol -- HTTP/1.1,\\
-http://www.ietf.org/rfc/rfc2616.txt,\\
-RFC 2616, IETF 1999.
-
-\bibitem{ssh}
-http://www.openssh.org.
-
-\bibitem{stunnel}
-http://www.stunnel.org.
-
-\end{thebibliography}
-\end{document}
